While a Rock Is Falling Straight Down with Negligible Air

question 69

Multiple Choice

While a rock is falling straight down with negligible air resistance, it has

• A) an increasing speed.
• B) a decreasing speed.
• C) an unchanging speed.
• D) zero speed.
• E) None of the above.

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Definitions:

Vertex

A point where two or more curves, lines, or edges meet; in geometry, it is often used to describe a corner point of a polygon or an angle.

Parabola

A symmetrical, curved, plane curve, which is the graph of a quadratic function.

Focus

A specific point used in the definition of conic sections, such as the vertex of a parabola or one of the two fixed points in an ellipse or hyperbola.

Standard Form

A way to write numbers using the digits 0-9, where each digit has its place value; in linear equations, Ax + By = C, where A, B, and C are integers.